-18=-6/7z

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Solution for -18=-6/7z equation: 


z in (-oo:+oo)

-18 = (-6/7)*z // - (-6/7)*z

-((-6/7)*z)-18 = 0

(6/7)*z-18 = 0

6/7*z-18 = 0 // + 18

6/7*z = 18 // : 6/7

z = 18/6/7

z = 21

z = 21

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